Oil seal



Jan. 22, A1935. A. F. GARDNER OIL SEAL Filed Jan. 7, 1953 Patented Jan. z2, 193s 1,938,552

'UNiTED sTATEs-`PATENT ori-ICE Allen F. Gardner, Detroit, Mich., assigner to Chicago Rawhide Manufacturing Company, Chicago, Ill., a corporation of Illinois Application January 7, 1933, Serial No. 650,609

3 Claims. (Cl. 288-1) This invention relates to oil seals of the self-' outspread engagement with the bottom of the contained type. cu'p 15 and with the axially extending portion 18 One object of the invention is to provide an in rotatable but snugly sealing engagement'with improved seal of the type described in which a the shaft 14. The radially extending portion 17 5 solid band of rubber or other suitable material is of the packing is clamped against the bottom of 5 loosely contained within the casing of the seal the cup 15v by the bottom of another cup 19 which under tension for constrictng the axially extendis nested Within the outer cup 15. The washer ing portion of the flanged packing. 1 6 is in turn clamped against the r'im of the inner Another object of the invention is to provide, in cup 1`9 and is held in place by a small inturned l such a seal, a constricting band which is smaller flange 20 on the rim o f the outer cup. 10

than the chamber in which positioned and yet is V'I'he band 12 is adapted to be placed under tenso arranged with respect to the other parts of the sion by the distension of the axially extending seal to eiectively close off the chamber. portion 18 of the packing in being fitted onto the Still another objectsto provide aseal in which shaft 14. 'Ihe band bears against the outer l Ythe pressure member which surrounds lthe axially surface of the axiallyy extending portion 18 of the l5 extending portion of the packing also engages with packing at 21; bears against the; end surface of the end of the axially extending portion. f the axially extending portion at 22, and bears Other more specic objects and advantages of against the inside face of the washer A16 `at 23.- the invention will be apparent to those skilled 'I'he band 12 is of considerably smaller cross-sec- "20 in the art upon a full understanding of the tional areaA than the hollow interior of the casing -20 construction, arrangement and operation of the and the outer periphery of the band is preferably parts which are combined to formv the improved spaced asubstantial distance from the inner surseal. face of the cylindrical wall of the casing 10, with In order that the invention may be readily the result that the band is subjected only to understood, two structurally diierent emboditension and is not placed under compression when 25 ments of the same are presented herein, but it in operation. The axially interlocking engage- Will of course be appreciated that. such embodiment of the band with the free edge of the packments are intended primarily for the purpose of ing protects such edge and also serves to maintain exemplication and that the invention is susthe band in snug butradially movable engage- :m ceptible of being embodied in other structurally ment with the washer 16, thereby forming an modied forms coming equally within the scape effective closure for the hollow interior of the of the appended claims. casing.

In the accompanying drawing "i In the modification which is shown in Fig. 3, the Fig. 1 is a diametric section through the imband 24, instead of being of the generally Z-shaped proved seal, showing the same in position on a radial section shown in Figs. 1 and'2, is of plain 35v Shaft in a housing; f rectangular-'cross section, but it is so proportioned Fig. 2 iS a face View 0f the Seal With portions with respect to the other parts of the assembly as broken away t0 dSClOSe the inside Construction; to lap inwardly alittle over the free edge 25 of the Fig. 3 iS a diametric section through a slightly packing when the latter is distended, thereby re- 40 different seal which .embodies another form `of the sulting in a cross-sectional distortion of the band l40 invention; and which causes the exposed portion 26 of the same to Fig. 4 is a vradial section through a seal, illuseiectively interlock and seal with the packing and trating still another embodiment of the inven- .the adjacent end wa11 27 of the casing. In this tion. y y embodiment the metal casing for the seal is also The seal which is shown in Figs. 1 and 2 inof somewhat` different construction. It consists 45 cludes a hollow inwardly Opening annular Sheet of an outer cup '28,y an inner cup 29 which is inmetal casing 10, a centrally apertured sheet leathversely nested within the cup 28, and a washer 3o ver packing 11 and a small elastic band 12 which which is clamped-against the radially extending iS preferably made of oil-impervious but elastic portion 31 of the packing by the rim ofthe. cup 29. rubber. The casing 10, which is adapted to be po- In Fig. 4 a seal is shown which includes a. metal 50 sitioned with a pressed t ina cylindrical housing springring 32. The ring 32, which is split at 33 13 about a centrally arranged shaft 14', is comin order to permitpf contraction,has a conical posedof a centrally apertured c up 15 and a washinner surface 34 which bears against the conical er 16. 'I'he packing 11 is arranged with the racut end 35 of the axially extending portion 36 of 1 dially extending portion 1'1 of the same in list the packing. l 55 I claim:

1. Ina seal, a hollow inwardly opening annular casing, a centrally apertured sheet leather packing having an vouter portion which is secured against one end wall of the casing and an inner axially extending portion which terminates in proximity to the inner edge of the other end wall, and an imperforate elastic ring which is expanded about the axially extending portion of the packing in spaced relation to the outer wall of the casing and is so arranged as to form a closure for the gap between the edge of the axially extending portion of the packing and the edge of the adjacent end wall of the casing.

2. In a seal, a hollow inwardly opening annular casing, a centrally apertured sheet leather-packing having a radially extending portion which is secured against one end wall of the casing and an axially extending portion which terminates in proximity to the inner edge oi the other end wall, and an imperforate elastic ring which is expanded about the axially extending portion of the packing and engages with the edge face of the axially extending portion.

3. In a seal, a holder, a centrally apertured sheet packing mounted in the holder and characterized by an axially extending portion, and a resiliently 10 expansible pressure member which surrounds the axially extending portion of the packing and also engages with the end of the axially extending portion, said pressure member being maintained against the end of the axially extending portion of l5 the packing by a portion of the holder.

ALLEN F.- GARDNER. 

